a hobby horse
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A subject, topic, or issue about which one frequently or incessantly talks, expounds, or complains. The term can also be spelled as a single word. Ah, here we go again. Once grandpa gets on his hobby-horse about the government, there's no stopping him! Uh oh, sounds like Janet is on her hobbyhorse again about the need for healthcare reform.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a ˈhobby horsea subject that somebody feels strongly about and likes to talk about: Sorry, I’m starting to get on my hobby horse! (= talk about my favourite subject).
Farlex Partner Idioms Dictionary © Farlex 2017